Funding for this research was provided by:
Youth Research Fund Project of the Health and Family Planning Commission of Nantong (WQ2015052)
Project for Medical Key Youth Talent of Nantong (Youth 005)
Received: 11 April 2020
Accepted: 7 July 2020
First Online: 30 July 2020
Ethics approval and consent to participate
: All the data supporting our findings in this paper were freely downloaded from the PubMed, EMBASE, and the Cochrane Library. No ethical approval or written informed consent for participation was required.
: Not applicable.
: The authors declare that they have no competing interests.